DFE State-Tracking Demapper for Soft-Input FEC in 800G Data Center Interconnects

Abstract

A simple one-step state model is used to track the DFE error propagation for 4-PAM. The knowledge of DFE output states is used to improve LLR accuracy. Demapping via DFE state tracking outperforms bit-interleaving and precoding schemes for the 802.3ca LDPC code by 0.76 dB

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